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Because Tom has been shot.
"Once safe, they proceed to where the raft is hidden and Tom tells Jim he is a free man again, and that he will always be a free man from now on. Jim thanks him and tells him it was a great escape plan. Tom then shows them where he got a bullet in the leg, but Jim is worried for Tom's health. Jim rips up one of the Duke's old shirts and ties up the leg with it."